函數(shù)的和、差、積、商的求導(dǎo)法則

(1)法則1：兩個函數(shù)的和(或差)的導(dǎo)數(shù)，等于這兩個函數(shù)的導(dǎo)數(shù)的和(或差)，即：_________．

(2)法則2：兩個函數(shù)的積的導(dǎo)數(shù)，等于第一個函數(shù)的導(dǎo)數(shù)乘以第二個函數(shù)加上第一個函數(shù)乘以第二個函數(shù)的導(dǎo)數(shù)，即：_________．

(3)常數(shù)與函數(shù)的積的導(dǎo)數(shù)等于常數(shù)乘以函數(shù)的導(dǎo)數(shù)，即：_________．

(4)法則3：兩個函數(shù)的商的導(dǎo)數(shù)，等于分子的導(dǎo)數(shù)與分母的積，減去分母的導(dǎo)數(shù)與分子的積，再除以分母的平方，即：_________．